New documents revealed by alleged NSA leaker Edward Snowden reportedly show how British cyber spies regularly stole secrets from foreign diplomats during the 2009 G-20 summit in London.

During espionage campaign, which was reported Sunday by the U.K.'s The Guardian newspaper, England's Government Communications Headquarters (GCHQ) allegedly set up internet cafes outfitted with email interception and key-logging software designed to track any delegates' computer use there. The GCHQ also allegedly hacked into delegates' blackberries to read their emails and gather phone call information.

The documents also reportedly show that the GCHQ's sister organization in the U.S., the National Security Agency (NSA), tried to eavesdrop on Russian leader Dmitry Medvedev as he telephoned back to Moscow via satellite.

One slide that appears to be from a "Top Secret" GCHQ presentation said, "Diplomatic targets from all nations have an MO [modus operandi] of using smart phones... Exploited this use at the G-20 meetings last year." According to The Guardian, another slide describes a method of email interception that can allow the spies to read people's email "before/as they do."

As The Guardian noted, the sophisticated espionage techniques appear "to have been organized for the more mundane purposes of securing an advantage in meetings." One slide brags about "recent successes" including the ability to deliver "messages to analysts during the G-20 in near real-time... [and] provide timely information to U.K. ministers."

The revelation on the G-20 came just hours before the United Kingdom began the smaller G-8 summit Monday. England's Prime Minister, David Cameron, and President Obama both spoke before reporters today at the G-8 but did not address The Guardian's allegations or Edward Snowden.

The first question fielded today by Snowden came from The Guardian columnist Glenn Greenwald, who published the first of the NSA surveillance stories based on Snowden's information. One thing Greenwald asked was if information would continue to leak if "anything happens" to Snowden.

"All I can say right now is the U.S. government is not going to be able to cover this up by jailing or murdering me," Snowden reportedly wrote back. "Truth is coming, and it cannot be stopped."

Top U.S. administration officials acknowledged and defended the previous surveillance programs revealed by Snowden. Late last week U.S. officials told ABC News they feared Snowden could defect to China with a head, and several computers, full of secrets. The Chinese foreign ministry reportedly denied that Snowden was their spy today.

During the online question and answer, Snowden denied that he had given any secret information to, and said he had "no contact" with, the Chinese government.

"This is a predictable smear that I anticipated before going public, as the U.S. media has a knee-jerk 'RED CHINA!' reaction to anything involving HK [Hong Kong] or the PRC [People's Republic of China], and is intended to distract from the issue of U.S. government misconduct," Snowden reportedly wrote. "Ask yourself: If I were a Chinese spy, why wouldn't I have flown directly to Beijing? I could be living in a palace petting a phoenix by now."